blob: 72bc5368396597f8555abf48f7eee3df3adbec44 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sunrpc/rpc_pipe.c
3 *
4 * Userland/kernel interface for rpcauth_gss.
5 * Code shamelessly plagiarized from fs/nfsd/nfsctl.c
Rolf Eike Beerd51fe1b2005-09-02 08:59:25 +02006 * and fs/sysfs/inode.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
9 *
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/string.h>
14#include <linux/pagemap.h>
15#include <linux/mount.h>
16#include <linux/namei.h>
Trond Myklebust50e437d2007-06-07 22:44:34 -040017#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/kernel.h>
19
20#include <asm/ioctls.h>
21#include <linux/fs.h>
22#include <linux/poll.h>
23#include <linux/wait.h>
24#include <linux/seq_file.h>
25
26#include <linux/sunrpc/clnt.h>
27#include <linux/workqueue.h>
28#include <linux/sunrpc/rpc_pipe_fs.h>
Trond Myklebust8854e822009-08-09 15:14:30 -040029#include <linux/sunrpc/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Al Virofc14f2f2010-07-25 01:48:30 +040031static struct vfsmount *rpc_mnt __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static int rpc_mount_count;
33
34static struct file_system_type rpc_pipe_fs_type;
35
36
Christoph Lametere18b8902006-12-06 20:33:20 -080037static struct kmem_cache *rpc_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define RPC_UPCALL_TIMEOUT (30*HZ)
40
Trond Myklebust9842ef32006-02-01 12:18:44 -050041static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
42 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050043{
44 struct rpc_pipe_msg *msg;
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050045
Trond Myklebust9842ef32006-02-01 12:18:44 -050046 if (list_empty(head))
47 return;
48 do {
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050049 msg = list_entry(head->next, struct rpc_pipe_msg, list);
Trond Myklebust5a676572010-09-12 19:55:25 -040050 list_del_init(&msg->list);
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050051 msg->errno = err;
52 destroy_msg(msg);
Trond Myklebust9842ef32006-02-01 12:18:44 -050053 } while (!list_empty(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 wake_up(&rpci->waitq);
55}
56
57static void
David Howells65f27f32006-11-22 14:55:48 +000058rpc_timeout_upcall_queue(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Trond Myklebust9842ef32006-02-01 12:18:44 -050060 LIST_HEAD(free_list);
David Howells65f27f32006-11-22 14:55:48 +000061 struct rpc_inode *rpci =
62 container_of(work, struct rpc_inode, queue_timeout.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 struct inode *inode = &rpci->vfs_inode;
Trond Myklebust9842ef32006-02-01 12:18:44 -050064 void (*destroy_msg)(struct rpc_pipe_msg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Trond Myklebust9842ef32006-02-01 12:18:44 -050066 spin_lock(&inode->i_lock);
67 if (rpci->ops == NULL) {
68 spin_unlock(&inode->i_lock);
69 return;
70 }
71 destroy_msg = rpci->ops->destroy_msg;
72 if (rpci->nreaders == 0) {
73 list_splice_init(&rpci->pipe, &free_list);
74 rpci->pipelen = 0;
75 }
76 spin_unlock(&inode->i_lock);
77 rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
J. Bruce Fields93a44a72007-11-06 13:06:03 -050080/**
Ben Hutchings1a5778a2010-02-14 22:35:47 -080081 * rpc_queue_upcall - queue an upcall message to userspace
J. Bruce Fields93a44a72007-11-06 13:06:03 -050082 * @inode: inode of upcall pipe on which to queue given message
83 * @msg: message to queue
84 *
85 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
86 * A userspace process may then later read the upcall by performing a
87 * read on an open file for this inode. It is up to the caller to
88 * initialize the fields of @msg (other than @msg->list) appropriately.
89 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090int
91rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
92{
93 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebust6070fe62005-10-27 22:12:46 -040094 int res = -EPIPE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Trond Myklebust9842ef32006-02-01 12:18:44 -050096 spin_lock(&inode->i_lock);
Trond Myklebust6070fe62005-10-27 22:12:46 -040097 if (rpci->ops == NULL)
98 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (rpci->nreaders) {
100 list_add_tail(&msg->list, &rpci->pipe);
101 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400102 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
104 if (list_empty(&rpci->pipe))
Trond Myklebust24c5d9d2006-03-20 13:44:08 -0500105 queue_delayed_work(rpciod_workqueue,
106 &rpci->queue_timeout,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 RPC_UPCALL_TIMEOUT);
108 list_add_tail(&msg->list, &rpci->pipe);
109 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400110 res = 0;
111 }
112out:
Trond Myklebust9842ef32006-02-01 12:18:44 -0500113 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 wake_up(&rpci->waitq);
115 return res;
116}
Trond Myklebust468039e2008-12-23 15:21:31 -0500117EXPORT_SYMBOL_GPL(rpc_queue_upcall);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Trond Myklebust6070fe62005-10-27 22:12:46 -0400119static inline void
120rpc_inode_setowner(struct inode *inode, void *private)
121{
122 RPC_I(inode)->private = private;
123}
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static void
126rpc_close_pipes(struct inode *inode)
127{
128 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebustb693ba42009-08-09 15:14:15 -0400129 const struct rpc_pipe_ops *ops;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500130 int need_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800132 mutex_lock(&inode->i_mutex);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500133 ops = rpci->ops;
134 if (ops != NULL) {
135 LIST_HEAD(free_list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500136 spin_lock(&inode->i_lock);
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500137 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 rpci->nreaders = 0;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500139 list_splice_init(&rpci->in_upcall, &free_list);
140 list_splice_init(&rpci->pipe, &free_list);
141 rpci->pipelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 rpci->ops = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500143 spin_unlock(&inode->i_lock);
144 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
145 rpci->nwriters = 0;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500146 if (need_release && ops->release_pipe)
Trond Myklebust9842ef32006-02-01 12:18:44 -0500147 ops->release_pipe(inode);
Trond Myklebust4011cd92007-08-07 15:33:01 -0400148 cancel_delayed_work_sync(&rpci->queue_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
Trond Myklebust6070fe62005-10-27 22:12:46 -0400150 rpc_inode_setowner(inode, NULL);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800151 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static struct inode *
155rpc_alloc_inode(struct super_block *sb)
156{
157 struct rpc_inode *rpci;
Christoph Lametere94b1762006-12-06 20:33:17 -0800158 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (!rpci)
160 return NULL;
161 return &rpci->vfs_inode;
162}
163
164static void
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100165rpc_i_callback(struct rcu_head *head)
166{
167 struct inode *inode = container_of(head, struct inode, i_rcu);
168 INIT_LIST_HEAD(&inode->i_dentry);
169 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
170}
171
172static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173rpc_destroy_inode(struct inode *inode)
174{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100175 call_rcu(&inode->i_rcu, rpc_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
178static int
179rpc_pipe_open(struct inode *inode, struct file *filp)
180{
181 struct rpc_inode *rpci = RPC_I(inode);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500182 int first_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 int res = -ENXIO;
184
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800185 mutex_lock(&inode->i_mutex);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500186 if (rpci->ops == NULL)
187 goto out;
188 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
189 if (first_open && rpci->ops->open_pipe) {
190 res = rpci->ops->open_pipe(inode);
191 if (res)
192 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500194 if (filp->f_mode & FMODE_READ)
195 rpci->nreaders++;
196 if (filp->f_mode & FMODE_WRITE)
197 rpci->nwriters++;
198 res = 0;
199out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800200 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return res;
202}
203
204static int
205rpc_pipe_release(struct inode *inode, struct file *filp)
206{
Trond Myklebust969b7f22006-01-03 09:55:36 +0100207 struct rpc_inode *rpci = RPC_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 struct rpc_pipe_msg *msg;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500209 int last_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800211 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (rpci->ops == NULL)
213 goto out;
Joe Perches655b5bb2010-09-04 18:52:53 -0700214 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (msg != NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500216 spin_lock(&inode->i_lock);
Trond Myklebust48e49182005-12-19 17:11:22 -0500217 msg->errno = -EAGAIN;
Trond Myklebust5a676572010-09-12 19:55:25 -0400218 list_del_init(&msg->list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500219 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 rpci->ops->destroy_msg(msg);
221 }
222 if (filp->f_mode & FMODE_WRITE)
223 rpci->nwriters --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500224 if (filp->f_mode & FMODE_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 rpci->nreaders --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500226 if (rpci->nreaders == 0) {
227 LIST_HEAD(free_list);
228 spin_lock(&inode->i_lock);
229 list_splice_init(&rpci->pipe, &free_list);
230 rpci->pipelen = 0;
231 spin_unlock(&inode->i_lock);
232 rpc_purge_list(rpci, &free_list,
233 rpci->ops->destroy_msg, -EAGAIN);
234 }
235 }
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500236 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
237 if (last_close && rpci->ops->release_pipe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 rpci->ops->release_pipe(inode);
239out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800240 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return 0;
242}
243
244static ssize_t
245rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
246{
Josef Sipek303b46b2006-12-08 02:37:42 -0800247 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 struct rpc_inode *rpci = RPC_I(inode);
249 struct rpc_pipe_msg *msg;
250 int res = 0;
251
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800252 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (rpci->ops == NULL) {
254 res = -EPIPE;
255 goto out_unlock;
256 }
257 msg = filp->private_data;
258 if (msg == NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500259 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (!list_empty(&rpci->pipe)) {
261 msg = list_entry(rpci->pipe.next,
262 struct rpc_pipe_msg,
263 list);
264 list_move(&msg->list, &rpci->in_upcall);
265 rpci->pipelen -= msg->len;
266 filp->private_data = msg;
267 msg->copied = 0;
268 }
Trond Myklebust9842ef32006-02-01 12:18:44 -0500269 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (msg == NULL)
271 goto out_unlock;
272 }
273 /* NOTE: it is up to the callback to update msg->copied */
274 res = rpci->ops->upcall(filp, msg, buf, len);
275 if (res < 0 || msg->len == msg->copied) {
276 filp->private_data = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500277 spin_lock(&inode->i_lock);
Trond Myklebust5a676572010-09-12 19:55:25 -0400278 list_del_init(&msg->list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500279 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 rpci->ops->destroy_msg(msg);
281 }
282out_unlock:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800283 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return res;
285}
286
287static ssize_t
288rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
289{
Josef Sipek303b46b2006-12-08 02:37:42 -0800290 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 struct rpc_inode *rpci = RPC_I(inode);
292 int res;
293
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800294 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 res = -EPIPE;
296 if (rpci->ops != NULL)
297 res = rpci->ops->downcall(filp, buf, len);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800298 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return res;
300}
301
302static unsigned int
303rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
304{
305 struct rpc_inode *rpci;
306 unsigned int mask = 0;
307
Josef Sipek303b46b2006-12-08 02:37:42 -0800308 rpci = RPC_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 poll_wait(filp, &rpci->waitq, wait);
310
311 mask = POLLOUT | POLLWRNORM;
312 if (rpci->ops == NULL)
313 mask |= POLLERR | POLLHUP;
J. Bruce Fieldseda4f9b2007-11-06 13:05:36 -0500314 if (filp->private_data || !list_empty(&rpci->pipe))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 mask |= POLLIN | POLLRDNORM;
316 return mask;
317}
318
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200319static long
320rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200322 struct inode *inode = filp->f_path.dentry->d_inode;
323 struct rpc_inode *rpci = RPC_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 int len;
325
326 switch (cmd) {
327 case FIONREAD:
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200328 spin_lock(&inode->i_lock);
329 if (rpci->ops == NULL) {
330 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 return -EPIPE;
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200332 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 len = rpci->pipelen;
334 if (filp->private_data) {
335 struct rpc_pipe_msg *msg;
Joe Perches655b5bb2010-09-04 18:52:53 -0700336 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 len += msg->len - msg->copied;
338 }
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200339 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 return put_user(len, (int __user *)arg);
341 default:
342 return -EINVAL;
343 }
344}
345
Arjan van de Venda7071d2007-02-12 00:55:36 -0800346static const struct file_operations rpc_pipe_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 .owner = THIS_MODULE,
348 .llseek = no_llseek,
349 .read = rpc_pipe_read,
350 .write = rpc_pipe_write,
351 .poll = rpc_pipe_poll,
Frederic Weisbecker674b6042010-05-19 15:08:17 +0200352 .unlocked_ioctl = rpc_pipe_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 .open = rpc_pipe_open,
354 .release = rpc_pipe_release,
355};
356
357static int
358rpc_show_info(struct seq_file *m, void *v)
359{
360 struct rpc_clnt *clnt = m->private;
361
362 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
363 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
364 clnt->cl_prog, clnt->cl_vers);
Chuck Levere7f78652006-08-22 20:06:19 -0400365 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
366 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
J. Bruce Fieldsbf19aac2007-09-26 14:38:09 -0400367 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return 0;
369}
370
371static int
372rpc_info_open(struct inode *inode, struct file *file)
373{
Trond Myklebust006abe82010-09-12 19:55:25 -0400374 struct rpc_clnt *clnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int ret = single_open(file, rpc_show_info, NULL);
376
377 if (!ret) {
378 struct seq_file *m = file->private_data;
Trond Myklebust006abe82010-09-12 19:55:25 -0400379
380 spin_lock(&file->f_path.dentry->d_lock);
381 if (!d_unhashed(file->f_path.dentry))
382 clnt = RPC_I(inode)->private;
383 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
384 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 m->private = clnt;
386 } else {
Trond Myklebust006abe82010-09-12 19:55:25 -0400387 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 single_release(inode, file);
389 ret = -EINVAL;
390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
392 return ret;
393}
394
395static int
396rpc_info_release(struct inode *inode, struct file *file)
397{
398 struct seq_file *m = file->private_data;
399 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
400
401 if (clnt)
402 rpc_release_client(clnt);
403 return single_release(inode, file);
404}
405
Arjan van de Venda7071d2007-02-12 00:55:36 -0800406static const struct file_operations rpc_info_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 .owner = THIS_MODULE,
408 .open = rpc_info_open,
409 .read = seq_read,
410 .llseek = seq_lseek,
411 .release = rpc_info_release,
412};
413
414
415/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 * Description of fs contents.
417 */
418struct rpc_filelist {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400419 const char *name;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800420 const struct file_operations *i_fop;
Trond Myklebust7364af62009-08-09 15:14:16 -0400421 umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422};
423
Trond Myklebust54281542006-03-20 13:44:49 -0500424struct vfsmount *rpc_get_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Trond Myklebust54281542006-03-20 13:44:49 -0500426 int err;
427
Al Virofc14f2f2010-07-25 01:48:30 +0400428 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count);
Trond Myklebust54281542006-03-20 13:44:49 -0500429 if (err != 0)
430 return ERR_PTR(err);
Al Virofc14f2f2010-07-25 01:48:30 +0400431 return rpc_mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400433EXPORT_SYMBOL_GPL(rpc_get_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Trond Myklebust54281542006-03-20 13:44:49 -0500435void rpc_put_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
Al Virofc14f2f2010-07-25 01:48:30 +0400437 simple_release_fs(&rpc_mnt, &rpc_mount_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400439EXPORT_SYMBOL_GPL(rpc_put_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Nick Pigginfe15ce42011-01-07 17:49:23 +1100441static int rpc_delete_dentry(const struct dentry *dentry)
Trond Myklebust62e17612007-06-08 14:14:46 -0400442{
443 return 1;
444}
445
Al Viro3ba13d12009-02-20 06:02:22 +0000446static const struct dentry_operations rpc_dentry_operations = {
Trond Myklebust62e17612007-06-08 14:14:46 -0400447 .d_delete = rpc_delete_dentry,
448};
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450static struct inode *
Trond Myklebust7364af62009-08-09 15:14:16 -0400451rpc_get_inode(struct super_block *sb, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 struct inode *inode = new_inode(sb);
454 if (!inode)
455 return NULL;
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400456 inode->i_ino = get_next_ino();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
459 switch(mode & S_IFMT) {
460 case S_IFDIR:
461 inode->i_fop = &simple_dir_operations;
462 inode->i_op = &simple_dir_inode_operations;
Dave Hansend8c76e62006-09-30 23:29:04 -0700463 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 default:
465 break;
466 }
467 return inode;
468}
469
Trond Myklebust75898062009-08-09 15:14:17 -0400470static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
471 umode_t mode,
472 const struct file_operations *i_fop,
473 void *private)
474{
475 struct inode *inode;
476
Trond Myklebustbeb0f0a2010-12-20 21:19:26 +0000477 d_drop(dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400478 inode = rpc_get_inode(dir->i_sb, mode);
479 if (!inode)
480 goto out_err;
481 inode->i_ino = iunique(dir->i_sb, 100);
482 if (i_fop)
483 inode->i_fop = i_fop;
484 if (private)
485 rpc_inode_setowner(inode, private);
486 d_add(dentry, inode);
487 return 0;
488out_err:
489 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
490 __FILE__, __func__, dentry->d_name.name);
491 dput(dentry);
492 return -ENOMEM;
493}
494
Trond Myklebustac6fece2009-08-09 15:14:20 -0400495static int __rpc_create(struct inode *dir, struct dentry *dentry,
496 umode_t mode,
497 const struct file_operations *i_fop,
498 void *private)
499{
500 int err;
501
502 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
503 if (err)
504 return err;
505 fsnotify_create(dir, dentry);
506 return 0;
507}
508
Trond Myklebust75898062009-08-09 15:14:17 -0400509static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
510 umode_t mode,
511 const struct file_operations *i_fop,
512 void *private)
513{
514 int err;
515
516 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
517 if (err)
518 return err;
519 inc_nlink(dir);
520 fsnotify_mkdir(dir, dentry);
521 return 0;
522}
523
524static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
525 umode_t mode,
526 const struct file_operations *i_fop,
527 void *private,
528 const struct rpc_pipe_ops *ops,
529 int flags)
530{
531 struct rpc_inode *rpci;
532 int err;
533
534 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
535 if (err)
536 return err;
537 rpci = RPC_I(dentry->d_inode);
538 rpci->nkern_readwriters = 1;
539 rpci->private = private;
540 rpci->flags = flags;
541 rpci->ops = ops;
542 fsnotify_create(dir, dentry);
543 return 0;
544}
545
Trond Myklebustac6fece2009-08-09 15:14:20 -0400546static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
547{
548 int ret;
549
550 dget(dentry);
551 ret = simple_rmdir(dir, dentry);
552 d_delete(dentry);
553 dput(dentry);
554 return ret;
555}
556
Trond Myklebust810d90b2009-08-09 15:14:18 -0400557static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
558{
559 int ret;
560
561 dget(dentry);
562 ret = simple_unlink(dir, dentry);
563 d_delete(dentry);
564 dput(dentry);
565 return ret;
566}
567
568static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
569{
570 struct inode *inode = dentry->d_inode;
571 struct rpc_inode *rpci = RPC_I(inode);
572
573 rpci->nkern_readwriters--;
574 if (rpci->nkern_readwriters != 0)
575 return 0;
576 rpc_close_pipes(inode);
577 return __rpc_unlink(dir, dentry);
578}
579
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400580static struct dentry *__rpc_lookup_create(struct dentry *parent,
581 struct qstr *name)
582{
583 struct dentry *dentry;
584
585 dentry = d_lookup(parent, name);
586 if (!dentry) {
587 dentry = d_alloc(parent, name);
588 if (!dentry) {
589 dentry = ERR_PTR(-ENOMEM);
590 goto out_err;
591 }
592 }
593 if (!dentry->d_inode)
Nick Pigginfb045ad2011-01-07 17:49:55 +1100594 d_set_d_op(dentry, &rpc_dentry_operations);
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400595out_err:
596 return dentry;
597}
598
599static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
600 struct qstr *name)
601{
602 struct dentry *dentry;
603
604 dentry = __rpc_lookup_create(parent, name);
Dan Carpenterf1f0abe2010-03-21 12:10:34 -0400605 if (IS_ERR(dentry))
606 return dentry;
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400607 if (dentry->d_inode == NULL)
608 return dentry;
609 dput(dentry);
610 return ERR_PTR(-EEXIST);
611}
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613/*
614 * FIXME: This probably has races.
615 */
Trond Myklebustac6fece2009-08-09 15:14:20 -0400616static void __rpc_depopulate(struct dentry *parent,
617 const struct rpc_filelist *files,
618 int start, int eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
620 struct inode *dir = parent->d_inode;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400621 struct dentry *dentry;
622 struct qstr name;
623 int i;
624
625 for (i = start; i < eof; i++) {
626 name.name = files[i].name;
627 name.len = strlen(files[i].name);
628 name.hash = full_name_hash(name.name, name.len);
629 dentry = d_lookup(parent, &name);
630
631 if (dentry == NULL)
632 continue;
633 if (dentry->d_inode == NULL)
634 goto next;
635 switch (dentry->d_inode->i_mode & S_IFMT) {
636 default:
637 BUG();
638 case S_IFREG:
639 __rpc_unlink(dir, dentry);
640 break;
641 case S_IFDIR:
642 __rpc_rmdir(dir, dentry);
643 }
644next:
645 dput(dentry);
646 }
647}
648
649static void rpc_depopulate(struct dentry *parent,
650 const struct rpc_filelist *files,
651 int start, int eof)
652{
653 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Arjan van de Venc6573c22006-07-03 00:25:16 -0700655 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400656 __rpc_depopulate(parent, files, start, eof);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800657 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658}
659
Trond Myklebustac6fece2009-08-09 15:14:20 -0400660static int rpc_populate(struct dentry *parent,
661 const struct rpc_filelist *files,
662 int start, int eof,
663 void *private)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
Trond Myklebustac6fece2009-08-09 15:14:20 -0400665 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 struct dentry *dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400667 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800669 mutex_lock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 for (i = start; i < eof; i++) {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400671 struct qstr q;
672
673 q.name = files[i].name;
674 q.len = strlen(files[i].name);
675 q.hash = full_name_hash(q.name, q.len);
676 dentry = __rpc_lookup_create_exclusive(parent, &q);
677 err = PTR_ERR(dentry);
678 if (IS_ERR(dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 goto out_bad;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400680 switch (files[i].mode & S_IFMT) {
681 default:
682 BUG();
683 case S_IFREG:
684 err = __rpc_create(dir, dentry,
685 files[i].mode,
686 files[i].i_fop,
687 private);
688 break;
689 case S_IFDIR:
690 err = __rpc_mkdir(dir, dentry,
691 files[i].mode,
692 NULL,
693 private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 }
Trond Myklebustac6fece2009-08-09 15:14:20 -0400695 if (err != 0)
696 goto out_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800698 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 return 0;
700out_bad:
Trond Myklebustac6fece2009-08-09 15:14:20 -0400701 __rpc_depopulate(parent, files, start, eof);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800702 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800704 __FILE__, __func__, parent->d_name.name);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400705 return err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400706}
Christoph Hellwig278c9952005-07-24 23:53:01 +0100707
Trond Myklebuste57aed72009-08-09 15:14:26 -0400708static struct dentry *rpc_mkdir_populate(struct dentry *parent,
709 struct qstr *name, umode_t mode, void *private,
710 int (*populate)(struct dentry *, void *), void *args_populate)
Trond Myklebustf1345852005-09-23 11:08:25 -0400711{
Trond Myklebustf1345852005-09-23 11:08:25 -0400712 struct dentry *dentry;
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400713 struct inode *dir = parent->d_inode;
Trond Myklebustf1345852005-09-23 11:08:25 -0400714 int error;
715
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400716 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
717 dentry = __rpc_lookup_create_exclusive(parent, name);
Trond Myklebustf1345852005-09-23 11:08:25 -0400718 if (IS_ERR(dentry))
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400719 goto out;
720 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
Trond Myklebust75898062009-08-09 15:14:17 -0400721 if (error != 0)
722 goto out_err;
Trond Myklebuste57aed72009-08-09 15:14:26 -0400723 if (populate != NULL) {
724 error = populate(dentry, args_populate);
725 if (error)
726 goto err_rmdir;
727 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400728out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800729 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400730 return dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400731err_rmdir:
Trond Myklebustf1345852005-09-23 11:08:25 -0400732 __rpc_rmdir(dir, dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400733out_err:
Trond Myklebustf1345852005-09-23 11:08:25 -0400734 dentry = ERR_PTR(error);
735 goto out;
736}
737
Trond Myklebuste57aed72009-08-09 15:14:26 -0400738static int rpc_rmdir_depopulate(struct dentry *dentry,
739 void (*depopulate)(struct dentry *))
Trond Myklebustf1345852005-09-23 11:08:25 -0400740{
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700741 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400742 struct inode *dir;
743 int error;
744
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700745 parent = dget_parent(dentry);
746 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700747 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebuste57aed72009-08-09 15:14:26 -0400748 if (depopulate != NULL)
749 depopulate(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400750 error = __rpc_rmdir(dir, dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800751 mutex_unlock(&dir->i_mutex);
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700752 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400753 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500756/**
757 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
758 * @parent: dentry of directory to create new "pipe" in
759 * @name: name of pipe
760 * @private: private data to associate with the pipe, for the caller's use
761 * @ops: operations defining the behavior of the pipe: upcall, downcall,
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500762 * release_pipe, open_pipe, and destroy_msg.
Randy Dunlap65b6e422008-02-13 15:03:23 -0800763 * @flags: rpc_inode flags
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500764 *
765 * Data is made available for userspace to read by calls to
766 * rpc_queue_upcall(). The actual reads will result in calls to
767 * @ops->upcall, which will be called with the file pointer,
768 * message, and userspace buffer to copy to.
769 *
770 * Writes can come at any time, and do not necessarily have to be
771 * responses to upcalls. They will result in calls to @msg->downcall.
772 *
773 * The @private argument passed here will be available to all these methods
774 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
775 */
Trond Myklebustb693ba42009-08-09 15:14:15 -0400776struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
777 void *private, const struct rpc_pipe_ops *ops,
778 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 struct dentry *dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400781 struct inode *dir = parent->d_inode;
Trond Myklebust7364af62009-08-09 15:14:16 -0400782 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400783 struct qstr q;
Trond Myklebust75898062009-08-09 15:14:17 -0400784 int err;
Trond Myklebust7364af62009-08-09 15:14:16 -0400785
786 if (ops->upcall == NULL)
787 umode &= ~S_IRUGO;
788 if (ops->downcall == NULL)
789 umode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400791 q.name = name;
792 q.len = strlen(name);
793 q.hash = full_name_hash(q.name, q.len),
794
795 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
796 dentry = __rpc_lookup_create(parent, &q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (IS_ERR(dentry))
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400798 goto out;
Trond Myklebust34f30892007-06-07 18:28:02 -0400799 if (dentry->d_inode) {
Trond Myklebust75898062009-08-09 15:14:17 -0400800 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
Trond Myklebust34f30892007-06-07 18:28:02 -0400801 if (rpci->private != private ||
802 rpci->ops != ops ||
803 rpci->flags != flags) {
804 dput (dentry);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400805 err = -EBUSY;
806 goto out_err;
Trond Myklebust34f30892007-06-07 18:28:02 -0400807 }
Trond Myklebust03a12562007-06-08 14:14:53 -0400808 rpci->nkern_readwriters++;
Trond Myklebust34f30892007-06-07 18:28:02 -0400809 goto out;
810 }
Trond Myklebust75898062009-08-09 15:14:17 -0400811
812 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
Trond Myklebust810d90b2009-08-09 15:14:18 -0400813 private, ops, flags);
Trond Myklebust75898062009-08-09 15:14:17 -0400814 if (err)
815 goto out_err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400816out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800817 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400818 return dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400819out_err:
820 dentry = ERR_PTR(err);
Trond Myklebust158998b2006-08-24 01:03:17 -0400821 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800822 __FILE__, __func__, parent->d_name.name, name,
Trond Myklebust75898062009-08-09 15:14:17 -0400823 err);
Trond Myklebustf1345852005-09-23 11:08:25 -0400824 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825}
Trond Myklebust468039e2008-12-23 15:21:31 -0500826EXPORT_SYMBOL_GPL(rpc_mkpipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500828/**
829 * rpc_unlink - remove a pipe
830 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
831 *
832 * After this call, lookups will no longer find the pipe, and any
833 * attempts to read or write using preexisting opens of the pipe will
834 * return -EPIPE.
835 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400836int
Trond Myklebust5d674762006-07-31 14:11:48 -0700837rpc_unlink(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838{
Trond Myklebust5d674762006-07-31 14:11:48 -0700839 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400840 struct inode *dir;
Trond Myklebust5d674762006-07-31 14:11:48 -0700841 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Trond Myklebust5d674762006-07-31 14:11:48 -0700843 parent = dget_parent(dentry);
844 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700845 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400846 error = __rpc_rmpipe(dir, dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800847 mutex_unlock(&dir->i_mutex);
Trond Myklebust5d674762006-07-31 14:11:48 -0700848 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400849 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850}
Trond Myklebust468039e2008-12-23 15:21:31 -0500851EXPORT_SYMBOL_GPL(rpc_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Trond Myklebuste57aed72009-08-09 15:14:26 -0400853enum {
854 RPCAUTH_info,
855 RPCAUTH_EOF
856};
857
858static const struct rpc_filelist authfiles[] = {
859 [RPCAUTH_info] = {
860 .name = "info",
861 .i_fop = &rpc_info_operations,
862 .mode = S_IFREG | S_IRUSR,
863 },
864};
865
866static int rpc_clntdir_populate(struct dentry *dentry, void *private)
867{
868 return rpc_populate(dentry,
869 authfiles, RPCAUTH_info, RPCAUTH_EOF,
870 private);
871}
872
873static void rpc_clntdir_depopulate(struct dentry *dentry)
874{
875 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
876}
877
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400878/**
879 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
Randy Dunlap4111d4f2009-09-23 14:36:38 -0400880 * @dentry: dentry from the rpc_pipefs root to the new directory
881 * @name: &struct qstr for the name
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400882 * @rpc_client: rpc client to associate with this directory
883 *
884 * This creates a directory at the given @path associated with
885 * @rpc_clnt, which will contain a file named "info" with some basic
886 * information about the client, together with any "pipes" that may
887 * later be created using rpc_mkpipe().
888 */
Trond Myklebust23ac6582009-08-09 15:14:25 -0400889struct dentry *rpc_create_client_dir(struct dentry *dentry,
Trond Myklebuste57aed72009-08-09 15:14:26 -0400890 struct qstr *name,
891 struct rpc_clnt *rpc_client)
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400892{
Trond Myklebuste57aed72009-08-09 15:14:26 -0400893 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
894 rpc_clntdir_populate, rpc_client);
895}
896
897/**
898 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
899 * @dentry: directory to remove
900 */
901int rpc_remove_client_dir(struct dentry *dentry)
902{
903 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400904}
905
Trond Myklebust8854e822009-08-09 15:14:30 -0400906static const struct rpc_filelist cache_pipefs_files[3] = {
907 [0] = {
908 .name = "channel",
909 .i_fop = &cache_file_operations_pipefs,
Trond Myklebust96c61cb2009-08-19 18:12:21 -0400910 .mode = S_IFREG|S_IRUSR|S_IWUSR,
Trond Myklebust8854e822009-08-09 15:14:30 -0400911 },
912 [1] = {
913 .name = "content",
914 .i_fop = &content_file_operations_pipefs,
915 .mode = S_IFREG|S_IRUSR,
916 },
917 [2] = {
918 .name = "flush",
919 .i_fop = &cache_flush_operations_pipefs,
920 .mode = S_IFREG|S_IRUSR|S_IWUSR,
921 },
922};
923
924static int rpc_cachedir_populate(struct dentry *dentry, void *private)
925{
926 return rpc_populate(dentry,
927 cache_pipefs_files, 0, 3,
928 private);
929}
930
931static void rpc_cachedir_depopulate(struct dentry *dentry)
932{
933 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
934}
935
936struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
937 mode_t umode, struct cache_detail *cd)
938{
939 return rpc_mkdir_populate(parent, name, umode, NULL,
940 rpc_cachedir_populate, cd);
941}
942
943void rpc_remove_cache_dir(struct dentry *dentry)
944{
945 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
946}
947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948/*
949 * populate the filesystem
950 */
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700951static const struct super_operations s_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 .alloc_inode = rpc_alloc_inode,
953 .destroy_inode = rpc_destroy_inode,
954 .statfs = simple_statfs,
955};
956
957#define RPCAUTH_GSSMAGIC 0x67596969
958
Trond Myklebustbb156742009-08-09 15:14:21 -0400959/*
960 * We have a single directory with 1 node in it.
961 */
962enum {
963 RPCAUTH_lockd,
964 RPCAUTH_mount,
965 RPCAUTH_nfs,
966 RPCAUTH_portmap,
967 RPCAUTH_statd,
968 RPCAUTH_nfsd4_cb,
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400969 RPCAUTH_cache,
Trond Myklebustbb156742009-08-09 15:14:21 -0400970 RPCAUTH_RootEOF
971};
972
973static const struct rpc_filelist files[] = {
974 [RPCAUTH_lockd] = {
975 .name = "lockd",
976 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
977 },
978 [RPCAUTH_mount] = {
979 .name = "mount",
980 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
981 },
982 [RPCAUTH_nfs] = {
983 .name = "nfs",
984 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
985 },
986 [RPCAUTH_portmap] = {
987 .name = "portmap",
988 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
989 },
990 [RPCAUTH_statd] = {
991 .name = "statd",
992 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
993 },
994 [RPCAUTH_nfsd4_cb] = {
995 .name = "nfsd4_cb",
996 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
997 },
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400998 [RPCAUTH_cache] = {
999 .name = "cache",
1000 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1001 },
Trond Myklebustbb156742009-08-09 15:14:21 -04001002};
1003
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004static int
1005rpc_fill_super(struct super_block *sb, void *data, int silent)
1006{
1007 struct inode *inode;
1008 struct dentry *root;
1009
1010 sb->s_blocksize = PAGE_CACHE_SIZE;
1011 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1012 sb->s_magic = RPCAUTH_GSSMAGIC;
1013 sb->s_op = &s_ops;
1014 sb->s_time_gran = 1;
1015
1016 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1017 if (!inode)
1018 return -ENOMEM;
Al Virofc7bed82010-01-25 18:30:38 -05001019 sb->s_root = root = d_alloc_root(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 if (!root) {
1021 iput(inode);
1022 return -ENOMEM;
1023 }
Trond Myklebustac6fece2009-08-09 15:14:20 -04001024 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
Al Virofc7bed82010-01-25 18:30:38 -05001025 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027}
1028
Al Virofc14f2f2010-07-25 01:48:30 +04001029static struct dentry *
1030rpc_mount(struct file_system_type *fs_type,
1031 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
Al Virofc14f2f2010-07-25 01:48:30 +04001033 return mount_single(fs_type, flags, data, rpc_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034}
1035
1036static struct file_system_type rpc_pipe_fs_type = {
1037 .owner = THIS_MODULE,
1038 .name = "rpc_pipefs",
Al Virofc14f2f2010-07-25 01:48:30 +04001039 .mount = rpc_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 .kill_sb = kill_litter_super,
1041};
1042
1043static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001044init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045{
1046 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1047
Christoph Lametera35afb82007-05-16 22:10:57 -07001048 inode_init_once(&rpci->vfs_inode);
1049 rpci->private = NULL;
1050 rpci->nreaders = 0;
1051 rpci->nwriters = 0;
1052 INIT_LIST_HEAD(&rpci->in_upcall);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -04001053 INIT_LIST_HEAD(&rpci->in_downcall);
Christoph Lametera35afb82007-05-16 22:10:57 -07001054 INIT_LIST_HEAD(&rpci->pipe);
1055 rpci->pipelen = 0;
1056 init_waitqueue_head(&rpci->waitq);
1057 INIT_DELAYED_WORK(&rpci->queue_timeout,
1058 rpc_timeout_upcall_queue);
1059 rpci->ops = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060}
1061
1062int register_rpc_pipefs(void)
1063{
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001064 int err;
1065
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
Paul Jacksonfffb60f2006-03-24 03:16:06 -08001067 sizeof(struct rpc_inode),
1068 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1069 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +09001070 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 if (!rpc_inode_cachep)
1072 return -ENOMEM;
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001073 err = register_filesystem(&rpc_pipe_fs_type);
1074 if (err) {
1075 kmem_cache_destroy(rpc_inode_cachep);
1076 return err;
1077 }
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return 0;
1080}
1081
1082void unregister_rpc_pipefs(void)
1083{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001084 kmem_cache_destroy(rpc_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 unregister_filesystem(&rpc_pipe_fs_type);
1086}